If Neymar makes his debut for Al Hilal against Al Riyad, it will most likely give him more freedom to show the great abilities he has. Moreover, coupled with his very adequate teammates. This will certainly make it easier for Neymar and his teammates at Al Hilal to score more goals in this match.
Al Hilal is a most successful club in Saudi Arabia and with financial support from PIF, they and three other big clubs become stronger than other clubs in Saudi Arabia. Neymar played matches for Brazil in last weeks and he already recovered from injury.
Will he play a debut for Al Hilal? I don't know but I think he will have it today, but not as a start player but will be as a substitution for Al Hilal. The club actually needs him but they can wait one more week for Neymar to recover from FIFA days and it is to help any injury on Neymar.
Because if you look at the H2H records of the two teams, Al Hilal is far superior to Al Riyadh. Apart from that, if you look at the current standings of the Saudi pro league, currently Al Hilal is in second place, while Al Riyadh is in 15th place in the standings.
So with these facts, and coupled with Al Hilal's very capable players. I am also very confident that Al Hilal will add another victory record over Al Riyadh.
But even so, it is possible that Al Riyadh will be able to surprise us all. So basically we have to watch the match later and see the results.
Al Riyadh is weaker than Al Hilal, from history to value of their squad. They can surprise Al Hilal and us as it is football but I have my belief on Al Hilal. They are simply stronger than Al Rihadh and can complete this match with three points.